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相关概念视频

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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通过聚凝-脱聚-再聚合战略,模块化访问具有调整性质的阿里法性聚碳酸盐和双闭环可回收性.

Wei-Ning Liu1, Mingqian Wang1, Zhiqiang Ding1

  • 1Tianjin Key Laboratory of Composite & Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China.

Angewandte Chemie (International ed. in English)
|April 28, 2025
PubMed
概括

一种新的"多重凝聚-脱聚合-再聚合"策略使高分子量亚利法性聚碳酸盐的高效合成成为可能. 这种方法允许在温和条件下进行调节性质和双闭环化学回收.

关键词:
亚利法性聚碳酸盐是一种多碳酸盐.闭环可回收性 闭环可回收性循环碳酸盐是一种循环碳酸盐.环开放聚合的聚合方式热塑性弹性体的热塑性弹性体.

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科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 高分子量 (>100 kDa) 具有可调节性和可回收性特性的亚利法性聚碳酸盐的高效合成仍然是一个挑战.
  • 现有的方法,如CO2 / 二氧化碳共聚合和二甲基碳酸盐/二醇聚凝,具有局限性.

研究的目的:

  • 开发一种用于制备结构多样化,高分子量亚利法性聚碳酸盐的多功能策略.
  • 为了实现可调节的热和机械性能,并实现有效的化学回收.

主要方法:

  • 采用了三步"多重凝聚-脱聚合-再聚合"的方法.
  • 低分子量聚碳酸盐是通过阶段增长聚凝合成的.
  • 催化去聚合产生了循环碳酸盐单体,用于环开聚合到高分子量 (>100 kDa).

主要成果:

  • 该策略成功地产生了高分子量 (>100 kDa) 的亚利法性聚碳酸盐.
  • 可调节的热和机械性能通过不同的替代剂实现,其中螺旋环聚碳酸具有高点 (217°C).
  • 通过闭环脱聚合或酒精分析证明了双闭环化学回收.
  • 合成了具有出色性能的Triblock热塑性弹性体.

结论:

  • "聚凝-脱聚-再聚合"的策略提供了一个强大的方法来创建先进的阿里法性聚碳酸盐.
  • 这种方法解决了在温和条件下对高性能,可回收聚合物的需求.
  • 开发的聚碳酸盐对各种应用具有有前途的性能.